If you're curious about the history of GPS, there's a fantastic write up here: - https://www.gpsworld.com/origins-gps-part-1/ https://www.gpsworld.com/origins-

If you're curious about the history of GPS, there's a fantastic write up here: - https://www.gpsworld.com/origins-gps-part-1/ https://www.gpsworld.com/origins-gps-part-1/ - https://www.gpsworld.com/origins-gps-part-2-fighting-survive/ https://www.gpsworld.com/origins-gps-part-2-fighting-survive... There's also a documentary on Amazon Prime: - https://www.amazon.com/Lonely-Halls-Meeting-GPS-Documentary/dp/B07J2QW13V https://www.amazon.com/Lonely-Halls-Meeting-GPS-Documentary/...